While the terms are often used interchangeably, they are not strictly the same thing. A rooflight is a broad term that refers to any window in the roof, while skylights typically refer to flat glass installations that follow the pitch of the roof. Roof lanterns, on the other hand, are more complex structures that often rise above the flat plane of the roof, offering not just light but also architectural interest. They usually consist of multiple panes and may have added features like vents.